Roundabout has had quite a few productions that were announced but that ended up never happening. In addition to the DESIRE UNDER THE ELMS that I already mentioned, I can think of:
FOOL FOR LOVE, directed by Ed Harris
THE PHILADELPHIA STORY, directed by Alex Timbers
The infamous LIPS TOGETHER TEETH APART production with Megan Mullally
MISS JULIE with Natasha Richardson and Philip Seymour Hoffman (wow--amazing to think of now that they're both gone)
A planned production of OUR TOWN that was cancelled when Paul Newman's production was brought to Broadway
"You travel alone because other people are only there to remind you how much that hook hurts that we all bit down on. Wait for that one day we can bite free and get back out there in space where we belong, sail back over water, over skies, into space, the hook finally out of our mouths and we wander back out there in space spawning to other planets never to return hurrah to earth and we'll look back and can't even see these lives here anymore. Only the taste of blood to remind us we ever existed. The earth is small. We're gone. We're dead. We're safe."
-John Guare, Landscape of the Body